 This paper compares the structural, optical and photocatalytic properties of TiO2 and AgDope TiO2 nanoparticles against different bacterial strains under visible light irradiation. The study reveals that AgDope TiO2 nanoparticles have a smaller band gap energy and higher antimicrobial activity, then TiO2 nanoparticles with zero viability achieved at lower concentrations for P aeroginosa. This article was authored by Kiran Gupta, R. P. Singh, Ashutosh Pandey and others.